Jack Hammer Weight Class 60 lb Shank Size 7/8 in x 4 1/4 in Maximum Blows per Minute 2 000 bpm Piston Bore Size 2 1/2 in Piston Stroke Length 2 5/8 in Retainer Type Latch Vibration Reducing Handles No Sound Reducing Muffler Yes Air Inlet Gender Male Air Inlet Size 3/4 in Air Inlet Type NPT Air Consumption 115 cfm For Use On Rock Hex Shank Size 7/8 in x 4 1/4 in Hole Depth 18 ft Hole Diameter 2 in Maximum Hole Depth 18 ft Maximum Hole Diameter 2 in Minimum Hose Size 3/4 in